dt-bindings: usb: tps6598x: Add tps25750

TPS25750 is USB TypeC PD controller which is a subset of TPS6598x.

Signed-off-by: Abdel Alkuor <abdelalkuor@geotab.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231003155842.57313-2-alkuor@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>